JP6380035B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine, and more particularly to an internal combustion engine in which an oil separation chamber and an auxiliary machine are provided on a side wall of a cylinder block.

  In an internal combustion engine mounted on a vehicle such as an automobile, air-fuel mixture and combustion gas leak into the crank chamber from the space between the piston and the cylinder inner wall during operation of the internal combustion engine, and so-called blow-by gas is generated. Is returned to the intake system, sent again into the combustion chamber, and burned again, thereby preventing the oil from being deteriorated by blow-by gas.

As an internal combustion engine provided with a conventional oil separation chamber, a breather chamber constituting an oil separation chamber is provided on a side wall of a cylinder block, and the breather chamber communicates with a crank chamber through a communication path (for example, Patent Document 1).
In addition, the internal combustion engine described in Patent Document 1 is provided with a starter device, which is an auxiliary machine, on the side of the breather chamber so as to be close to the side wall of the cylinder block.

Japanese Patent No. 3715214

  However, in such a conventional internal combustion engine, since the starter device is provided on the side of the breather chamber so as to be close to the side wall of the cylinder block, the breather chamber is blocked by the starter device. The breather chamber cannot be protruded greatly from the side wall of the cylinder block.

For this reason, there is a possibility that the capacity of the breather chamber cannot be increased and the oil separation performance cannot be improved. On the other hand, in order to increase the capacity of the breather chamber, it is conceivable to form a breather chamber having a large capacity inside the cylinder block, that is, inside the side wall of the cylinder block.
However, if a breather chamber having a large capacity is formed inside the cylinder block, the cylinder block is increased in size and the engine including the cylinder block and the starter device is increased in size as a whole.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an internal combustion engine in which an auxiliary machine and a cylinder block can be installed in a small size while increasing the capacity of an oil separation chamber. To do.

The present invention is provided at a cylinder block having a plurality of cylinders, an oil separation chamber that protrudes from a side wall of the cylinder block and separates oil from blow-by gas, and an end of the cylinder block in the cylinder row direction. And an auxiliary machine attached to the flange part and protruding from the flange part along the side wall, wherein the oil separation chamber is parallel to a protruding direction of the auxiliary machine. A linear oil separation chamber that extends in a straight line; and a vertical oil separation chamber that is formed at an end of the linear oil separation chamber in the extending direction and extends in a direction perpendicular to the protruding direction of the auxiliary machine. And forming a recess surrounded by the flange portion, the linear oil separation chamber, the vertical oil separation chamber and the side wall, and at least a part of the auxiliary machine, And a thing which projects into the recess from the serial flange.

According to the present invention, the oil separation chamber formed to protrude from the side wall of the cylinder block has a linear linear oil separation chamber extending in parallel with the protruding direction of the auxiliary machine, and an end portion in the extending direction of the linear oil separation chamber. When formed with a vertical oil separation chamber that extends in the vertical direction and the protruding direction of the auxiliary machine, when the side wall is the bottom surface, a flange, a straight oil separation chamber, a vertical oil separation chamber, and a recess surrounded by the side wall are formed In addition, at least a part of the auxiliary machine protrudes from the flange portion into the recess.

  Thus, the amount of protrusion of the oil separation chamber can be increased with respect to the side wall of the cylinder block, and the auxiliary machine can be installed close to the side wall of the cylinder block. For this reason, it is possible to reduce the size of the internal combustion engine by increasing the capacity of the oil separation chamber and improving the oil separation performance, and by installing the auxiliary machine and the cylinder block together.

FIG. 1 is a diagram showing an embodiment of an internal combustion engine of the present invention, and is a schematic configuration diagram of an internal combustion engine provided with an oil separation chamber. FIG. 2 is a view showing an embodiment of the internal combustion engine of the present invention, and is a longitudinal sectional view of the internal combustion engine provided with an oil separation chamber. FIG. 3 is a view showing an embodiment of the internal combustion engine of the present invention, and is a perspective view of the internal combustion engine provided with an oil separation chamber with a cylinder head cover and a chain case removed. FIG. 4 is a view showing an embodiment of the internal combustion engine of the present invention, and is a side view of the internal combustion engine. FIG. 5 is a view showing an embodiment of the internal combustion engine of the present invention, and is a side view of the internal combustion engine with the intake manifold removed. 6 is a view showing an embodiment of the internal combustion engine of the present invention, and is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a view showing an embodiment of the internal combustion engine of the present invention, and is a perspective view of a main part of the internal combustion engine in a state in which the oil separation chamber is viewed obliquely from below.

Embodiments of an internal combustion engine according to the present invention will be described below with reference to the drawings.
1 to 7 are views showing an internal combustion engine according to an embodiment of the present invention.
First, the configuration will be described. 1 to 7, the left and right and front and rear directions represent the left and right and front and rear directions of the vehicle as viewed from the driver's seat.

  1 to 5, an engine 1 as an internal combustion engine mounted on a vehicle such as an automobile is provided with a cylinder block 2, a cylinder head 3 provided on the upper part of the cylinder block 2, and an upper part of the cylinder head 3. A cylinder head cover 4 and an oil pan 5 provided at the lower part of the cylinder block 2 are provided.

  In FIG. 1, a cylinder block 2 accommodates a piston 28 that is accommodated in a cylinder 27 so as to be movable up and down, a crankshaft 6 that converts the vertical motion of the piston 28 into a rotational motion, and the like. Is integrally provided with a crankcase 2A that rotatably supports the crankshaft 6. A crank chamber 24 is formed between the crankcase 2 </ b> A and the oil pan 5. Here, the cylinder 27 of the present embodiment constitutes a cylinder of the present invention.

  1 and 3, the cylinder head 3 extends along the arrangement direction of the cylinders 27, and is arranged in parallel with the intake cam shaft 7 and the intake cam shaft 7 provided with the intake cam 7a. And an exhaust cam shaft 8 provided with an exhaust cam 8a. Here, the intake camshaft 7 and the exhaust camshaft 8 of the present embodiment constitute the camshaft of the present invention.

  In the engine 1 of the present embodiment, a space between the cylinder head 3 and the cylinder head cover 4 in which the intake camshaft 7 and the exhaust camshaft 8 are housed constitutes a valve operating chamber 13. The intake camshaft 7 and the exhaust camshaft 8 are rotatably supported on the cylinder head 3 by a plurality of cam caps 3A (see FIG. 3).

  In FIG. 1, an intake port 29 and an exhaust port 30 are formed in the cylinder head 3, and the intake port 29 and the exhaust port 30 are driven by an intake valve 31 and an exhaust valve 31 that are driven as the intake cam 7 a and the exhaust cam 8 a rotate. The exhaust valve 32 is opened and closed.

  A branch pipe 34 of an intake manifold 33 is attached to the cylinder head 3, and an air cleaner 35 is connected to the intake manifold 33. The air cleaner 35 purifies the intake air Ai taken from the outside.

The intake air Ai purified by the air cleaner 35 is distributed from the branch pipe 34 of the intake manifold 33 to each cylinder 27 via each intake port 29 and is sucked.
A throttle valve 34 </ b> A is provided on the upstream side of the intake manifold 33, and this throttle valve 34 </ b> A adjusts the amount of air taken into the cylinder 27.

  In FIG. 3, an intake cam sprocket 9 is provided at the end of the intake camshaft 7, and a timing chain 11 is wound around the intake cam sprocket 9. An exhaust cam sprocket 10 is provided at the end of the exhaust cam shaft 8, and a timing chain 11 is wound around the exhaust cam sprocket 10.

  A crank sprocket 12 is provided at the end of the crankshaft 6, and a timing chain 11 is wound around the crank sprocket 12. Thereby, the rotation of the crankshaft 6 is transmitted from the crank sprocket 12 to the intake cam sprocket 9 and the exhaust cam sprocket 10 via the timing chain 11, and the intake camshaft 7 and the exhaust camshaft 8 rotate.

  When the intake cam 7a and the exhaust cam 8a rotate, the intake valve 31 and the exhaust valve 32 open and close the intake port 29 and the exhaust port 30 (see FIG. 1), respectively, so that the combustion chamber 14 ( 1) and the intake port 29 and the exhaust port 30 are communicated and blocked. In this way, the intake chain 31 and the exhaust valve 32 are operated according to the rotation of the crankshaft 6 by the timing chain 11.

  In FIG. 2, a chain case 21 is provided at the ends of the cylinder block 2 and the cylinder head 3 (the front side of the engine 1). The chain case 21 covers the timing chain 11 and forms a chain housing chamber 22 between the cylinder block 2 and the chain case 21, and the chain housing chamber 22 communicates with the crank chamber 24.

  1 to 7, an oil separation chamber 17 is formed on the side wall 2B of the cylinder block 2, and the oil separation chamber 17 is formed on the side wall 2B so as to protrude outward from the side wall 2B of the cylinder block 2. The case portion 40 and the cover member 41 attached to the open end of the case portion 40 are formed in a crank shape.

  3, 4, 5, and 7, there is a flange at one end 2 a of the cylinder block 2 in the arrangement direction of the cylinders 27, that is, in the cylinder row direction, that is, at the rear end in the front-rear direction in the engine 1 of the cylinder block 2. A part 51 is provided. A starter motor 52 is attached to the flange 51 (see FIGS. 4, 5, and 6). The starter motor 52 extends in the direction in which the crankshaft 6 extends from the flange 51 along the side wall 2B (front and rear in the engine 1). Direction). Here, the direction in which the crankshaft 6 extends is the direction in which the rotation center axis of the crankshaft 6 extends.

  Further, the chain case 21 of the present embodiment is a cylinder block positioned on the opposite side (front end in the front-rear direction in the engine 1) with respect to the one end 2a of the cylinder block 2 provided with the flange 51 with the side wall 2B interposed therebetween. 2 is provided at the other end 2b (see FIGS. 2 to 5 and 7).

  Here, the one end 2a of the side wall 2B of the present embodiment constitutes an end of the cylinder block in the cylinder row direction of the present invention, and the starter motor 52 constitutes an auxiliary machine of the present invention. Further, the other end 2b of the cylinder block 2 constitutes an end of the cylinder block located on the opposite side across the side wall of the present invention.

  In FIG. 2, the oil separation chamber 17 is formed in a linear oil separation chamber 42 extending in parallel with the protruding direction of the starter motor 52 and one end portion 42 c in the extending direction of the oil separating chamber 42, and the protruding direction of the starter motor 52. An oil separation chamber 43 extending downward in the vertical direction, and an oil separation chamber 44 formed at the other end portion 42d in the extending direction of the oil separation chamber 42 and extending upward in the vertical direction with respect to the protruding direction of the starter motor 52.

  These oil separation chambers 42, 43, 44 are configured to include a case portion 40, a cover member 41, and a space surrounded by the case portion 40 and the cover member 41.

  Here, the oil separation chamber 42 of the present embodiment constitutes a linear oil separation chamber of the present invention, and the oil separation chamber 43 constitutes a vertical oil separation chamber of the present invention. Moreover, the one end part 42c of the extending direction of the oil separation chamber 42 comprises the edge part of the extending direction of the linear oil separation chamber of this invention.

  The oil separation chamber 43 is provided with a partition wall 43A. The partition wall 43A protrudes from the side wall 2B toward the cover member 41, and a gap 45 is formed between the tip in the protruding direction and the cover member 41 (see FIG. 6).

  In FIG. 2, the oil separation chamber 42 is provided with partition walls 42A and 42B. The partition walls 42 </ b> A and 42 </ b> B protrude from the side wall 2 </ b> B toward the cover member 41, and a gap is formed between the front ends of the partition walls 42 </ b> A and 42 </ b> B in the protruding direction and the cover member 41.

  The oil separation chamber 43 is formed with an introduction port 43 a, and the introduction port 43 a communicates with the chain housing chamber 22 through a communication path 23 formed in the cylinder block 2. As a result, the blow-by gas flowing from the crank chamber 24 to the chain housing chamber 22 is introduced into the oil separation chamber 43 from the communication passage 23 through the introduction port 43a.

  Here, as indicated by an arrow B in FIG. 1, the blow-by gas B is an air-fuel mixture and combustion gas that leaks into the crank chamber 24 from between the piston 28 and the inner wall of the cylinder 27 as the engine 1 is operated.

In FIG. 2, an introduction port 43 b is formed at the bottom of the oil separation chamber 43, and the introduction port 43 b communicates with the crank chamber 24 via the communication path 20 formed in the cylinder block 2. Thereby, the blow-by gas B flowing through the crank chamber 24 is directly introduced into the oil separation chamber 43 from the communication path 20 through the introduction port 43b. The introduction ports 43a and 43b are formed on the upstream side in the direction in which the blow-by gas flows with respect to the partition wall 43A.
Here, the communication path 23 of this embodiment comprises the 1st communication path of this invention, and the communication path 20 comprises the 2nd communication path.

  In FIG. 6, a lead-out hole 41 </ b> A is formed in the cover member 41. 1 and 5 to 7, a blow-by gas outlet pipe 36 is attached to the cover member 41, and the oil separation chamber 44 communicates with the intake manifold 33 through the outlet hole 41 </ b> A through the blow-by gas outlet pipe 36. . The blow-by gas introduced into the oil separation chamber 44 is sucked into the branch pipe 34 from the blow-by gas outlet pipe 36 through the intake manifold 33 by the suction negative pressure of the engine 1.

  Here, in the oil separation chamber 17 of the present embodiment, blow-by gas introduced from the crank chamber 24 and the chain housing chamber 22 into the oil separation chamber 43 through the communication passages 20 and 23 collides with the partition wall 43A. Oil is separated from the blow-by gas and introduced into the oil separation chamber 42 through the gap 45.

The blow-by gas introduced into the oil separation chamber 42 is introduced into the oil separation chamber 44 after colliding with the partition walls 42A and 42B to separate the oil, and the blow-by gas introduced into the oil separation chamber 44 is blow-by gas. Suction is performed by the outlet tube 36.
The blow-by gas sucked into the intake manifold 33 is introduced into the combustion chamber 14 of the engine 1 and combusted in the combustion chamber 14 together with the air-fuel mixture.

  A PCV valve 37 (see FIG. 1) is provided between the oil separation chamber 44 and the blow-by gas outlet pipe 36. The PCV valve 37 controls the flow rate of blow-by gas flowing from the oil separation chamber 44 to the blow-by gas outlet pipe 36. adjust.

  In FIG. 1, an air cleaner 35 on the upstream side of the cylinder head cover 4 and the throttle valve 34A is connected by a fresh air introduction pipe 38. The fresh air introduction pipe 38 is a part of the intake air Ai, that is, a new air. Qi An is introduced into the valve train 13.

  A fresh air introduction passage 39 is formed in the cylinder block 2 and the cylinder head 3, and the fresh air introduction passage 39 communicates the valve operating chamber 13 and the crank chamber 24. Fresh air An introduced into the valve operating chamber 13 from the fresh air introduction pipe 38 by the suction negative pressure is introduced from the chain housing chamber 22 into the oil separation chamber 43 through the communication passage 23 and the introduction port 43a.

  Further, the fresh air An introduced into the valve operating chamber 13 from the fresh air introduction pipe 38 is introduced into the oil separation chamber 43 from the fresh air introduction passage 39 through the crank chamber 24, the communication passage 20 and the introduction port 43b. The blow-by gas introduced into the oil separation chamber 42 is sucked into the oil separation chamber 44 through the oil separation chamber 42 and then introduced into the cylinder 27 from the blow-by gas outlet pipe 36 through the intake manifold 33. Thereby, the inside of the engine 1 including the valve operating chamber 13, the chain housing chamber 22, and the crank chamber 24 is ventilated by the fresh air An.

  3 to 7, ribs 53 are formed on the side wall 2B of the cylinder block 2 located below the oil separation chamber 17, and the ribs 53 are arranged in the cylinder row direction from the side wall 2B, that is, the axis of the crankshaft 6. It extends along the direction. Here, the rib 53 of the present embodiment functions as a reinforcing member that increases the strength of the cylinder block 2.

  3 and 7, when the side wall 2B of the cylinder block 2 is the bottom surface, the cylinder block 2 includes a flange portion 51, a rib 53, oil separation chambers 42 and 43, and a recess 54 surrounded by the side wall 2B. ing.

  4 to 6, the starter motor 52 protrudes from the flange portion 51 into the space below the oil separation chamber 42, and in particular, the starter motor 52 of the present embodiment protrudes from the flange portion 51 into the recess 54. (See FIGS. 4 and 5).

In the starter motor 52 of the present embodiment, a portion of the starter motor 52 excluding the base portion on the flange portion 51 side protrudes from the flange portion 51 into the recess 54, but is not limited to this, and the starter motor 52 is not limited thereto. May protrude from the flange portion 51 into the recess 54.
In the engine 1 of the present embodiment, at least a part of the starter motor 52 only has to protrude from the flange portion 51 into the recess 54 in the space below the oil separation chamber 42.

  In FIG. 3, an oil jet 55 is provided in the cylinder block 2 so as to be positioned in the chain housing chamber 22, and the oil jet 55 injects lubricating oil onto the timing chain 11.

  3 to 5, a knock sensor 56 is provided on the side wall 2 </ b> B of the cylinder block 2, and the knock sensor 56 detects vibration generated in the cylinder block 2 due to knocking of the engine 1.

  The oil separation chamber 42 is provided below the knock sensor 56, and the oil separation chamber 44 extends upward from the other end 42 d of the oil separation chamber 42 so as to overlap the knock sensor 56 in the front-rear direction of the engine 1. ing. That is, the oil separation chamber 17 of the present embodiment is formed on the side wall 2B of the cylinder block 2 so as to avoid the knock sensor 56.

  Therefore, as shown in FIG. 5, a space for installing the end portion of the blow-by gas outlet pipe 36 in the rearward direction of the engine 1 with respect to the knock sensor 56 is secured, and the cover member 41 of the oil separation chamber 44 is secured. A blow-by gas lead-out pipe 36 can be connected.

Next, the operation will be described.
In the chain housing chamber 22, the oil is injected from the oil jet 55 to the timing chain 11, whereby the timing chain 11 is lubricated. For this reason, if the chain storage chamber 22 is not sufficiently ventilated, NOx (nitrogen oxide) contained in the blow-by gas introduced into the chain storage chamber 22 reacts with moisture to generate nitric acid, and the oil The nitric acid agglomerates to generate sludge.

  This sludge is a tar-like substance, and when the sludge is mixed into the oil that lubricates the engine 1, it causes deterioration of the oil, malfunction of the hydraulic system, the crankshaft 6, the intake camshaft 7, and the exhaust cam. Lubrication failure of the sliding member such as the shaft 8 is caused, the sliding resistance of the engine 1 is increased, and the fuel consumption of the engine 1 is deteriorated.

  As shown in FIG. 2, in the engine 1 of the present embodiment, the cylinder block 2 has a communication passage 23 that communicates the oil separation chamber 43 and the chain housing chamber 22, and the communication passage 23 is oil through the inlet 43 a. It communicates with the separation chamber 43.

  Thereby, blow-by gas can flow directly from the chain housing chamber 22 to the oil separation chamber 43. For this reason, the chain housing chamber 22 can be directly ventilated through the communication path 23, and sludge can be prevented from being generated in the chain housing chamber 22.

  The blow-by gas introduced from the chain housing chamber 22 into the oil separation chamber 43 through the communication passage 23 collides with the partition wall 43A and is separated into oil, and then introduced into the oil separation chamber 42. Further, blow-by gas is introduced into the oil separation chamber 43 from the crank chamber 24 through the communication path 20.

  The blow-by gas introduced into the oil separation chamber 42 from the chain housing chamber 22 and the crank chamber 24 is introduced into the oil separation chamber 44 after colliding with the partition walls 42A and 42B and separating the oil. Since the oil separation chamber 44 extends upward from the oil separation chamber 42, the oil is separated by its own weight even when the oil is still contained in the blow-by gas introduced into the oil separation chamber 44.

  The blow-by gas from which oil has been separated in the oil separation chamber 17 is introduced into the combustion chamber 14 from the lead-out hole 41A through the blow-by gas lead-out pipe 36 and the branch pipe 34 of the intake manifold 33.

  According to the engine 1 of the present embodiment, the oil separation chamber 17 formed to protrude from the side wall 2B of the cylinder block 2 has a linear oil separation chamber 42 extending substantially parallel to the protruding direction of the starter motor 52, A part of the starter motor 52 was protruded from the flange portion 51 into a space below the oil separation chamber 42.

  Thereby, the protruding amount of the oil separation chamber 17 can be increased with respect to the side wall 2B of the cylinder block 2, and the starter motor 52 can be installed close to the side wall 2B of the cylinder block 2. Therefore, the starter motor 52 and the cylinder block 2 can be installed together in a small size while the capacity of the oil separation chamber 17 is increased to improve the oil separation performance, and the engine 1 can be downsized.

  Further, according to the engine of the present embodiment, the rib 53 protruding from the side wall 2B and extending along the cylinder row direction is provided on the side wall 2B of the cylinder block 2 positioned below the oil separation chamber 17.

  In addition to this, when the oil separation chamber 17 has an oil separation chamber 43 formed at one end 42c of the oil separation chamber 42 and extending in a direction substantially perpendicular to the protruding direction of the starter motor 52, the side wall 2B is the bottom surface. In addition, a recess 54 surrounded by the flange portion 51, the rib 53, the oil separation chambers 42, 43 and the side wall 2 </ b> B was formed, and a part of the starter motor 52 was protruded from the flange portion 51 into the recess 54.

  Accordingly, a part of the starter motor 52 is protruded into the recess 54 formed by protruding the oil separation chamber 42 and the oil separation chamber 43 from the side wall 2B of the cylinder block 2, so that the starter motor 52 is It can be installed close to the side wall 2B. For this reason, the starter motor 52 and the cylinder block 2 can be installed together more effectively, and the engine 1 can be reduced in size more effectively.

Further, when the protruding direction of the oil separation chamber 17 is the depth of the recessed portion 54, the protruding amount of the oil separating chamber 17 with respect to the side wall 2 </ b> B can be increased by deepening the recessed portion 54. The capacity can be increased more effectively. For this reason, the oil separation performance can be improved more effectively.

  Further, according to the present embodiment, the cylinder block 2 includes the crank chamber 24 that houses the crankshaft 6, and the cylinder block 2 that is located on the opposite side to the one end 2a of the cylinder block 2 in which the flange portion 51 is provided. A chain case 21 is provided at the end 2b and covers the timing chain 11 that transmits the driving force of the crankshaft 6 to the camshaft.

  In addition, a chain housing chamber 22 is formed between the chain case 21 and the cylinder block 2, and the cylinder block 2 communicates with the communication passage 23 that connects the oil separation chamber 43 and the chain housing chamber 22, and the oil separation chamber 43. And a communication passage 20 that communicates with the crank chamber 24.

  As a result, the capacity of the oil separation chamber 17 can be increased even when the starter motor 52 is brought closer to the side wall 2B of the cylinder block 2, so that blow-by gas is introduced not only from the crank chamber 24 but also from the chain housing chamber 22 into the oil separation chamber 43. In some cases, the oil can be easily separated from the blowby gas. For this reason, it can suppress that blow-by gas containing oil is carried to the combustion chamber 14 by the suction negative pressure. Therefore, it is possible to prevent the combustion from deteriorating due to generation of white smoke or the like.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 ... Engine (internal combustion engine), 2 ... Cylinder block, 2a ... One end part (end part of the cylinder block of a cylinder row direction), 2b ... End of cylinder block), 6 ... crankshaft, 7 ... intake camshaft (camshaft), 8 ... exhaust camshaft (camshaft), 11 ... timing chain, 17 .... Oil separation chamber, 20 ... communication passage (second communication passage), 21 ... chain case, 22 ... chain storage chamber, 23 ... communication passage (first communication passage), 24. ..Crank chamber, 27 ... Cylinder (cylinder), 40 ... Case portion (oil separation chamber), 41 ... Cover member (oil separation chamber), 42 ... Oil separation chamber (linear oil separation chamber) ), 42c ... One end (end in the direction in which the linear oil separation chamber extends) 43 ... Oil separation chamber (vertical oil separation chamber), 51 ... Flange, 52 ... Starter motor ( Machine), 53 ... ribs, 54 ... recess

Claims (3)

A cylinder block having a plurality of cylinders; an oil separation chamber that protrudes from a side wall of the cylinder block and separates oil from blow-by gas; and a flange portion provided at an end of the cylinder block in the cylinder row direction. An internal combustion engine including an auxiliary machine attached to the flange portion and protruding from the flange portion along the side wall,
The oil separation chamber is formed at a linear linear oil separation chamber extending in parallel with the protruding direction of the auxiliary machine, and at an end in the extending direction of the linear oil separating chamber, and is perpendicular to the protruding direction of the auxiliary machine. An extending vertical oil separation chamber,
When the side wall is a bottom surface, the flange portion, the linear oil separation chamber, the vertical oil separation chamber, and a recess surrounded by the side wall are formed, and at least a part of the auxiliary machine is moved from the flange portion to the recess. An internal combustion engine characterized by projecting into Ribs protruding from the side wall and extending along the cylinder row direction are provided on the side wall of the cylinder block located above or below the oil separation chamber,
A portion of the auxiliary, wherein the flange portion from the flange portion, the rib, the linear oil separation chamber, according to claim 1, characterized in that was issued collision in a recess surrounded by said vertical oil separation chamber and the side wall The internal combustion engine described in 1. The cylinder block is provided at an end of the cylinder block that is located on the opposite side of the side wall with respect to the end of the cylinder block in which the crankshaft that houses the crankshaft and the flange is provided. A chain case that covers a timing chain that transmits the driving force of the crankshaft to the camshaft,
A chain housing chamber is formed between the chain case and the cylinder block,
The cylinder block includes a first communication path that communicates the oil separation chamber and the chain housing chamber, and a second communication path that communicates the oil separation chamber and the crank chamber. The internal combustion engine according to claim 1 or 2.

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